netdev - Re: [PATCH] virtio-net: put virtio net header inline with data

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Message-ID: <871u78eavc.fsf@rustcorp.com.au>
Date:	Tue, 09 Jul 2013 11:46:23 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	Cong Wang <amwang@...hat.com>, Amos Kong <akong@...hat.com>,
	Dave Jones <davej@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio-net: put virtio net header inline with data

"Michael S. Tsirkin" <mst@...hat.com> writes:
> For small packets we can simplify xmit processing
> by linearizing buffers with the header:
> most packets seem to have enough head room
> we can use for this purpose.
> Since existing hypervisors require that header
> is the first s/g element, we need a feature bit
> for this.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>
> Note: this needs to be applied on top of patch
> defining VIRTIO_F_ANY_LAYOUT - bit to be
> selected by Rusty.
>
> The following patch should work for any definition of
> VIRTIO_F_ANY_LAYOUT - I used bit 31 for testing.
> Rusty, could you please pick a valid bit for VIRTIO_F_ANY_LAYOUT
> and squeeze this patch into 3.11?

Sorry, it's too late.

First, I've been a bit lax in sending patches via DaveM, and this is
definitely his territory (ie. more net than virtio).

Secondly, it needs baking and testing time.

Cheers,
Rusty.
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